Changing Coil packs. Is there a guide

On my drive home last night my car started juddering and the engine light was flashing on the dash. I slowed down and could feel and hear the car missfiring everytime I pressed the gas. Vagcom has picked up the following:

I'm suffering from little power dips at the mo, and I'm wondering if it is heat / maf related or electrical. Still waiting for my new VAGCOM lead to turn up, to see whats happening, hopefully it'll turn out to be something like this then - a 2min fix sounds good!!!

I've been suffering with power dips / hesitancy lately. I can hear the turbo spooling up (more than I recall when the car was new) when suddenly the turbo can go quiet and it almost feels as though someone is applying the brakes - theres no pattern to it and sometimes when its really bad it can bring up the engine management warning on the display.
Well I finally got my VAG-COM lead and thought this would be the first thing Id investigate . Like Westle before I got very similar fault codes returned, 16684 & 16685 (which is cylinder 1 and not 2) - which obviously have the same possible causes as above.
Although, missing from that list is the following:
Air Intake System leaking
Fuel Supply faulty
Injector(s) faulty
Ignition Cable(s) and/or Spark Plug(s) faulty
Ignition Coil(s) faulty
Exhaust Gas Recirculation (EGR) Valve (N18) stuck/open
Camshaft Position Sensor (G40) faulty
Yesterday I cleared the faults and took it for a spin. The car felt really good, which I cant quite understand, but then ½ hour in, the car started to do its thing - maybe not as bad as before and it didnt bring up the engine management warning. So, back in to the pits and I plug in - no faults returned - so I start thinking this isnt a major engine problem and is probably air or electrical related?
Late last night / early this morning (empty roads) I took it out for a right good blast and I found there actually is a pattern - above a ton, it stops doing it and starts to pull really really strongly - this now makes me think that its actually air related.
Anyone got an ideas, what other tests, VAG-COM or otherwise, can I do to start narrowing this down.
Thanks for reading / listening!!!

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